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Application

The Minicap is suitable for the level detection of powdery and fine-grain bulk solids, such as grain, flour, powdered milk, mixed feed, cement, chalk or gypsum and is suitable for use in dust explosive areas (ATEX II 1/3 D). The Minicap has two output options:

Relay output (SPDT) or

PNP output

Function

The Minicap is an electronic switch. When the limit is exceeded or the load falls below the limit, a switching signal is output. A switch housing or signal output device (e.g. lights, horns, programmable logic sequencer, stored program control, etc.) can be connected to the Minicap. It has an in-built switch-over facility for minimum/ maximum safety. It detects the formation of deposits on the probe, and compensates for the effects of this so that the switching point is maintained. The Minicap comes with factory settings.

Other sensitivity adjustments can be made on the housing.

Application Example

Level detection in silos with bulk goods. The silos can be made of various materials (e.g. metal, plastic, concrete), as these do not affect measurement.

The filling stream should not be directed onto the probe.

a) load

Applications

Examples

ρ in g/l (approx.)

εr (approx.)

Function

Grain, seed, legumes and their products

Rice

770

3.0

yes

Cornstarch (packed)

680

2.6

yes

Flour (wheat)

580

2.4

yes

Corn grist

500

2.1

yes

Sunflower seeds

380

1.9

yes

Noodles

370

1.9

yes

Bran (wheat)

250

1.7

yes

Popcorn

30

1.1

no

Minerals, inorganic materials

Cement

1050

2.2

yes

Plaster

730

1.8

yes

Chalk (packed)

540

1.6

(yes)

Chalk (loose)

360

1.4

no

Plastics

ABS granulate

630

1.7

yes

PA granulate

620

1.7

yes

PE granulate

560

1.5

no

PVC powder

550

1.4

no

PU dust

80

1.1

no

Grey background:Application limits of Minicap exceeded.

In general:

If the dielectric constant of the solid is not known, then the density of the solid is a deciding factor. Under normal conditions the Minicap functions in foodstuffs with a density of 250 g/l and above or in plastic or mineral materials with a density of 600 g/l and above.